[Backport] Move recently added functions to V8_USE_EXTERNAL_STARTUP_DATA

With the change in https://codereview.chromium.org/1665513002
the contributor missed out adding couple of the functions within
appropriate #if defined(V8_USE_EXTERNAL_STARTUP_DATA) block

BUG=

Review URL: https://codereview.chromium.org/1909383004

gin/v8_initializer.cc

@@ -398,6 +398,20 @@ base::PlatformFile V8Initializer::GetOpenSnapshotFileForChildProcesses(
   *region_out = opened.second;
   return opened.first;
 }
+
+// static
+base::FilePath V8Initializer::GetNativesFilePath(bool abi_32_bit) {
+  base::FilePath path;
+  GetV8FilePath(abi_32_bit ? kNativesFileName32 : kNativesFileName64, &path);
+  return path;
+}
+
+// static
+base::FilePath V8Initializer::GetSnapshotFilePath(bool abi_32_bit) {
+  base::FilePath path;
+  GetV8FilePath(abi_32_bit ? kSnapshotFileName32 : kSnapshotFileName64, &path);
+  return path;
+}
 #endif  // defined(OS_ANDROID)
 #endif  // defined(V8_USE_EXTERNAL_STARTUP_DATA)
 
@@ -461,20 +475,4 @@ void V8Initializer::GetV8ExternalSnapshotData(const char** natives_data_out,
   }
 }
 
-#if defined(OS_ANDROID)
-// static
-base::FilePath V8Initializer::GetNativesFilePath(bool abi_32_bit) {
-  base::FilePath path;
-  GetV8FilePath(abi_32_bit ? kNativesFileName32 : kNativesFileName64, &path);
-  return path;
-}
-
-// static
-base::FilePath V8Initializer::GetSnapshotFilePath(bool abi_32_bit) {
-  base::FilePath path;
-  GetV8FilePath(abi_32_bit ? kSnapshotFileName32 : kSnapshotFileName64, &path);
-  return path;
-}
-#endif  // defined(OS_ANDROID)
-
 }  // namespace gin